Quarterly report pursuant to Section 13 or 15(d)

Funds Held for Clients and Corporate Investments (Classification of Investments on Consolidated Balance Sheets) (Details)

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Funds Held for Clients and Corporate Investments (Classification of Investments on Consolidated Balance Sheets) (Details) - USD ($)
$ in Millions
Nov. 30, 2017
May 31, 2017
Funds held for clients $ 4,888.2 $ 4,301.9
Corporate investments 81.4 138.8
Long-term corporate investments 480.9 454.0
Total funds held for clients and corporate investments, Fair value $ 5,450.5 $ 4,894.7